Engine size on plenum..?
Discussion
waynester said:
Mine states 3.9..even though it is a 4.0? I have seen other 4 litre cars and plenums showing 400, 4.0!
I am confused, do i have a 3.9 fitted? Had a change of plenum or what..?
It's the same size..
My 4451cc is a 4.5 ... they just round up or down when they feel like it
rev-erend said:
waynester said:
Mine states 3.9..even though it is a 4.0? I have seen other 4 litre cars and plenums showing 400, 4.0!
I am confused, do i have a 3.9 fitted? Had a change of plenum or what..?
It's the same size..
My 4451cc is a 4.5 ... they just round up or down when they feel like it
Ok, i know my car is a 400..and shows 3.9,
but i have seen other 400's..and they show 400 or 4.0 on their plenums?
Was it just a TVR thing, availability of plenums..etc?
>> Edited by waynester on Monday 29th November 14:05
waynester said:
waynester said:
Mine states 3.9..even though it is a 4.0? I have seen other 4 litre cars and plenums showing 400, 4.0!
I am confused, do i have a 3.9 fitted? Had a change of plenum or what..?
It's the same size..
My 4451cc is a 4.5 ... they just round up or down when they feel like it
Ok, i know my car is a 400..and shows 3.9,
but i have seen other 400's..and they show 400 or 4.0 on their plenums?
Was it just a TVR thing, availability of plenums..etc?
>> Edited by waynester on Monday 29th November 14:05
It's an odd situation but IMHO the rev is correct. The standard Rover one has 3.9 on it. The engine is 3947cc. Put whatever you like on the plenum; many are blank.
The 3.9 IS a 4.0 and the 4.5 a 4.6. The only difference is the later engines with Serp drive had bigger journals/Big ends and cross bolting.
When the Range Rover programme came along, P38A, the one that recently gave way to the BMW styled/engined monstrosity, the team where going to fit the 3.9 and 3.9 S/C both with the 3947cc engine as fitted to the Disco/original RR 3.9 but with the internal stuff changed, Serp driven and crank driven oil pump. The 3.9 S/C was dropped for various reasons and the 4551cc unit decided to be fitted but the Engines team under Alex Stephenson decided to differentiate the engines and call then 4.0 and 4.6 hence 4.0SE and 4.6HSE on the RR. TVR where playing with these numbers many years earlier. Note however that the earlier 3.9 SE engines usually the AR numbered units are actually a 3907cc unit as these where specials made from the 3.5 though the latter 3.9SE units and the 4.0SE units where essentially the 3.9RR item or in some instances the 3.5 unit but with the re-bore and 3.9 RR liners, etc fitted.
More complex than a complex thing that has taken complex lessons from Dr. Complex of Complex University!
Hope that all makes sense.
TaS (Former Chief Eng'r in Land Rover Powertrain!)
When the Range Rover programme came along, P38A, the one that recently gave way to the BMW styled/engined monstrosity, the team where going to fit the 3.9 and 3.9 S/C both with the 3947cc engine as fitted to the Disco/original RR 3.9 but with the internal stuff changed, Serp driven and crank driven oil pump. The 3.9 S/C was dropped for various reasons and the 4551cc unit decided to be fitted but the Engines team under Alex Stephenson decided to differentiate the engines and call then 4.0 and 4.6 hence 4.0SE and 4.6HSE on the RR. TVR where playing with these numbers many years earlier. Note however that the earlier 3.9 SE engines usually the AR numbered units are actually a 3907cc unit as these where specials made from the 3.5 though the latter 3.9SE units and the 4.0SE units where essentially the 3.9RR item or in some instances the 3.5 unit but with the re-bore and 3.9 RR liners, etc fitted.
More complex than a complex thing that has taken complex lessons from Dr. Complex of Complex University!
Hope that all makes sense.
TaS (Former Chief Eng'r in Land Rover Powertrain!)
. No markings on the plenum chamber, but it does say it on the V5 
tasmania said:
The 3.9 IS a 4.0 and the 4.5 a 4.6. The only difference is the later engines with Serp drive had bigger journals/Big ends and cross bolting.
When the Range Rover programme came along, P38A, the one that recently gave way to the BMW styled/engined monstrosity, the team where going to fit the 3.9 and 3.9 S/C both with the 3947cc engine as fitted to the Disco/original RR 3.9 but with the internal stuff changed, Serp driven and crank driven oil pump. The 3.9 S/C was dropped for various reasons and the 4551cc unit decided to be fitted but the Engines team under Alex Stephenson decided to differentiate the engines and call then 4.0 and 4.6 hence 4.0SE and 4.6HSE on the RR. TVR where playing with these numbers many years earlier. Note however that the earlier 3.9 SE engines usually the AR numbered units are actually a 3907cc unit as these where specials made from the 3.5 though the latter 3.9SE units and the 4.0SE units where essentially the 3.9RR item or in some instances the 3.5 unit but with the re-bore and 3.9 RR liners, etc fitted.
More complex than a complex thing that has taken complex lessons from Dr. Complex of Complex University!
Hope that all makes sense.
TaS (Former Chief Eng'r in Land Rover Powertrain!)
True for the Rover V8 as a whole but as pointed out two posts later the 4.6 was never fitted to wedges, it was a 4441, I believe formed using a Pontiac/Chevvy crank.
I made a point of this when I bought my 450SE as it has a 3.9 in a raised casting on the plenum. The plenum was from a 3.9 Range rover tweaked accordingly by TVR Power and the 3.9 not being removed. Later TVRs had the raised lettering ground off and stickers with engine size on as per Griff and Chimp apparently.
The important thing is the engine size on the V5 form !!! So 4441cc it is then !!!
Regards
Nige'
The important thing is the engine size on the V5 form !!! So 4441cc it is then !!!
Regards
Nige'
You can change the engine size on the V5 by changing the number in pen and sending it off so in theory it could say anything. My SEAC said 3498 and Tasmin Sports like most Wedges as thats how they were homologated - When I sent in the change of ownership stuff I put 4200 on the document as thats what the engine is and low and behold I then had a V5 with 4200 on it. Don't take the V5 as a guarentee of engine size. Best thing is to get the engine number and talk to either TVR power or the club registrar (If available) to verify actual engine size when the car was built.
TaS
TaS
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